1. Species Hydrocena (Omphalotropis) aurantiaca (Deshayes, 1832) accepted as Omphalotropis aurantiaca (Deshayes, 1832) accepted as Omphalotropis rubens (Quoy & Gaimard, 1832) (unaccepted combination)
2. Species Hydrocena (Omphalotropis) ceramensis L. Pfeiffer, 1862 accepted as Omphalotropis ceramensis (L. Pfeiffer, 1862) (original combination)
3. Species Hydrocena (Omphalotropis) dubia (L. Pfeiffer, 1846) accepted as Omphalotropis dubia (L. Pfeiffer, 1846) (unaccepted combination)
4. Species Hydrocena (Omphalotropis) erosa (Quoy & Gaimard, 1832) accepted as Omphalotropis erosa (Quoy & Gaimard, 1832) (unaccepted combination)
5. Species Hydrocena (Omphalotropis) expansilabris (L. Pfeiffer, 1854) accepted as Omphalotropis expansilabris (L. Pfeiffer, 1854) (unaccepted combination)
6. Species Hydrocena (Omphalotropis) exquisita L. Pfeiffer, 1855 accepted as Limborelia exquisita (L. Pfeiffer, 1855) (unaccepted combination)
7. Species Hydrocena (Omphalotropis) fulvida L. Pfeiffer, 1862 accepted as Cyclotropis carinata (I. Lea, 1856) (a junior synonym)
8. Species Hydrocena (Omphalotropis) glabrata L. Pfeiffer, 1855 accepted as Omphalotropis glabrata (L. Pfeiffer, 1855) (original combination)
9. Species Hydrocena (Omphalotropis) globosa (W. H. Benson, 1854) accepted as Omphalotropis globosa (W. H. Benson, 1854) (unaccepted combination)
10. Species Hydrocena (Omphalotropis) granum L. Pfeiffer, 1855 accepted as Omphalotropis granum (L. Pfeiffer, 1855) (original combination)
11. Species Hydrocena (Omphalotropis) hieroglyphica (Potiez & Michaud, 1838) accepted as Omphalotropis hieroglyphica (Potiez & Michaud, 1838) (unaccepted combination)
12. Species Hydrocena (Omphalotropis) huaheinensis L. Pfeiffer, 1855 accepted as Omphalotropis huaheinensis (L. Pfeiffer, 1855) (basionym)
13. Species Hydrocena (Omphalotropis) malleata L. Pfeiffer, 1855 accepted as Omphalotropis malleata (L. Pfeiffer, 1855) (original combination)
14. Species Hydrocena (Omphalotropis) maritima Montrouzier, 1863 accepted as Omphalotropis granum (L. Pfeiffer, 1855)
15. Species Hydrocena (Omphalotropis) multilirata (L. Pfeiffer, 1854) accepted as Omphalotropis multilirata (L. Pfeiffer, 1854) † (unaccepted combination)
16. Species Hydrocena (Omphalotropis) plicosa (L. Pfeiffer, 1854) accepted as Omphalotropis plicosa (L. Pfeiffer, 1854) (unaccepted combination)
17. Species Hydrocena (Omphalotropis) pupoides (Anton, 1838) accepted as Omphalotropis pupoides (Anton, 1838) (unaccepted combination)
18. Species Hydrocena (Omphalotropis) radiata L. Pfeiffer, 1855 accepted as Omphalotropis radiata (L. Pfeiffer, 1855) (original combination)
19. Species Hydrocena (Omphalotropis) rosea (A. Gould, 1847) accepted as Omphalotropis rosea (A. Gould, 1847) (unaccepted combination)
20. Species Hydrocena (Omphalotropis) rubens (Quoy & Gaimard, 1832) accepted as Omphalotropis rubens (Quoy & Gaimard, 1832) (unaccepted combination)
21. Species Hydrocena (Omphalotropis) scitula (A. Gould, 1847) accepted as Omphalotropis scitula (A. Gould, 1847) (unaccepted combination)
22. Species Hydrocena (Omphalotropis) terebralis (A. Gould, 1847) accepted as Omphalotropis terebralis (A. Gould, 1847) (unaccepted combination)
23. Species Hydrocena (Omphalotropis) vallata (A. Gould, 1847) accepted as Omphalotropis vallata (A. Gould, 1847) (unaccepted combination)
24. Species Hydrocena (Omphalotropis) vestita L. Pfeiffer, 1855 accepted as Lyrotropis vestita (L. Pfeiffer, 1855)

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